/*
 * Youtem Design System — Klein Blue (IKB)
 * Primary: International Klein Blue #002FA7
 * Reference: https://klein.design.weimob.com/
 */

/* ===== 设计令牌 ===== */
:root {
    /* 克莱因蓝色阶 */
    --color-primary-50: #eef1fb;
    --color-primary-100: #d9e0f7;
    --color-primary-200: #b3c1ef;
    --color-primary-300: #8ca2e7;
    --color-primary-400: #6683df;
    --color-primary-500: #3f64d7;
    --color-primary-600: #002FA7;
    --color-primary-700: #00268a;
    --color-primary-800: #001d6d;
    --color-primary-900: #001450;

    /* 语义主色别名 */
    --color-primary: #002FA7;
    --color-primary-hover: #00268a;
    --color-primary-active: #001d6d;
    --color-primary-rgb: 0, 47, 167;
    --primary-color: #002FA7;
    --primary-dark: #00268a;
    --primary-light: #3f64d7;
    --primary-color-rgb: 0, 47, 167;

    /* 中性色 — 干净 SaaS 灰阶 */
    --color-gray-50: #f7f8fa;
    --color-gray-100: #f0f2f5;
    --color-gray-200: #e5e8ef;
    --color-gray-300: #d0d5e0;
    --color-gray-400: #9aa3b5;
    --color-gray-500: #6b7385;
    --color-gray-600: #4a5160;
    --color-gray-700: #2f3542;
    --color-gray-800: #1c2130;
    --color-gray-900: #0f1320;

    /* 语义色 */
    --color-success: #0f9d6e;
    --color-error: #e5484d;
    --color-warning: #f5a524;
    --color-info: #002FA7;

    /* 间距 — 8px 基准 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4.5rem;

    /* 圆角 — Klein 中等圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* 阴影 — 轻量克制 */
    --shadow-sm: 0 1px 2px rgba(15, 19, 32, 0.04);
    --shadow-md: 0 4px 12px rgba(15, 19, 32, 0.06);
    --shadow-lg: 0 8px 24px rgba(15, 19, 32, 0.08);
    --shadow-xl: 0 16px 40px rgba(15, 19, 32, 0.1);
    --shadow-2xl: 0 24px 48px rgba(0, 47, 167, 0.12);
    --shadow-primary: 0 6px 16px rgba(0, 47, 167, 0.28);

    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* 字体 — 中文优先清晰排版 */
    --font-family-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 0.9375rem;
    --font-size-lg: 1.0625rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.5rem;

    --line-height-tight: 1.3;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* Bootstrap 变量对齐克莱因蓝 */
    --bs-primary: #002FA7;
    --bs-primary-rgb: 0, 47, 167;
    --bs-link-color: #002FA7;
    --bs-link-hover-color: #00268a;
}

/* ===== 基础排版 ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    color: var(--color-gray-800);
    line-height: var(--line-height-normal);
    background: var(--light-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: 0.01em;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-gray-900);
    font-weight: 650;
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
}

a {
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* ===== Bootstrap 主色覆盖 ===== */
.btn-primary {
    background-color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
    color: #fff !important;
    border-radius: var(--radius-lg);
    font-weight: 560;
    box-shadow: none;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-primary-hover) !important;
    border-color: var(--color-primary-hover) !important;
    box-shadow: var(--shadow-primary);
}

.btn-primary:active,
.btn-primary.active {
    background-color: var(--color-primary-active) !important;
    border-color: var(--color-primary-active) !important;
}

.btn-outline-primary {
    color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
    border-radius: var(--radius-lg);
    font-weight: 560;
    background: transparent !important;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
    background-color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
    color: #fff !important;
}

.text-primary { color: var(--color-primary) !important; }
.bg-primary { background-color: var(--color-primary) !important; }
.border-primary { border-color: var(--color-primary) !important; }

.link-primary {
    color: var(--color-primary) !important;
}
.link-primary:hover {
    color: var(--color-primary-hover) !important;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.12);
}

.page-link {
    color: var(--color-primary);
}
.page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.badge.bg-primary {
    background-color: var(--color-primary) !important;
}

/* ===== 卡片 / 区块 ===== */
.modern-card {
    background: #fff;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-xl);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
    border: 1px solid var(--color-gray-200);
}

.modern-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-200);
    transform: none;
}

.section-block {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.03em;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-2xl);
    max-width: 40rem;
}

/* ===== 按钮 ===== */
.btn-modern {
    padding: 0.7rem 1.35rem;
    border-radius: var(--radius-lg);
    font-weight: 560;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-modern:hover {
    box-shadow: var(--shadow-primary);
}

.btn-modern:active {
    transform: translateY(1px);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar-track-piece {
    width: 10px;
    background-color: var(--color-gray-100);
}
::-webkit-scrollbar {
    width: 8px;
    height: 6px;
}
::-webkit-scrollbar-thumb {
    height: 50px;
    background-color: rgba(0, 47, 167, 0.25);
    border-radius: 1000px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 47, 167, 0.45);
}